[DeTomaso] 3 Wire ALT REWIRE Instructions/Help!?

Mon Mar 28 02:08:05 EDT 2022

You can also sense on the battery wire on the starter relay. That is a very good connection to the positive terminal on the battery. Normally there is no current flow through that wire so there will be no voltage drop.
That said, I have the sense wire connected there and my ammeter frequently flutters throughout the scale. I suspect the reason is that the wiring from the alternator through the ammeter to the battery doesn’t handle the 130A alternator very well. I also have a 60A ammeter. I will need to experiment some with this.

/Thomas

> 28 mars 2022 kl. 06:26 skrev Forest Goodhart <forestg at att.net>:
> 
>    Steve,
>   Attached is the most common wiring for the 3G alternator. If you want
>   the most accurate sensing location I suggest the ammeter connection,
>   load side but either will work. I sense at the battery connection on
>   the alternator and it seems to work fine.
>   Forest
> 
>   On Sunday, March 27, 2022, 05:25:52 PM PDT, Steve Liebenow
>   <steven.liebenow at att.net> wrote:
>     Hey all!
>     Ready to go about installing firewall bump reduction, and need some
>     help with prior alt wiring.
>     My 74 came to me with a late model Ford 3G(?) 3 wire alternator
>     installed, and a messed up glob of wires at the alt area on the rear
>   of
>     the firewall behind the passenger seat.  I "reduced the mess" to
>     acceptable but paid no heed to "what is correct".  Presumed that it
>   was
>     connected properly.....    Car runs, battery charges, alt gauge
>     flutters sometimes......  I want to confirm that the load sensing is
>     being done properly.
>     Then I read an article which Mike D sent me from MAD enterprises with
>   a
>     great explanation about why we want to use a 3 wire alt, (with
>   onboard
>     regulator), vs a real life "1-wire" alternator which really is only
>     good for something like a tractor or a remote generator where there
>   are
>     NO accessories.
>     The article explains remote sensing and how it is important to under
>     stand "where" to connect wires to that alternator is given a
>   realistic
>     reading of "load".  Typically this would be more of a common point in
>     the main feed harness that is some distance away from the alternator.
>     You could sense directly at the alternator, or even the battery, but
>     that isn't preferred either way.
>     So I looked at the wiring diagrams and see a junction #1 on SOBills
>     excellent adventure in electrical diagrams, but no idea exactly where
>     this is!    The of course we have two distribution panels of sorts,
>     left of dash and right of dash.  Who's on first!
>     SO, main alt out wire connects normally to large wire which heads off
>     somewhere.....fuse panels and ign switch.  Remote sensing wire
>     connects to "a point far far away" (but not sure which lead this is
>   on
>     my late model Ford 3G(?) alternator......and then there is one more
>     terminal that I have no idea what/where it goes.... perhaps an
>   exciter
>     voltage to turn on alt??    That takes care of the three alt wires,
>   but
>     that doesn't help with what appears to be an old 4th wire that feeds
>     the dash bulb indicator......
>     I believe that Hall sold this alt years back, but I found no
>   paperwork
>     with it in the PO's records.... No idea who installed it
>     either.......so kinda stuck!
>     The GM type 3 wire alt is also lacking clear instructions, in the
>     instructions......so no help there with the reduction kit.  ( Small
>     amount of work needed here.....)  It really appears to have been
>     written early on for directly using original alternator.....but some
>     crossed wires with the late model application, which falls short of
>     calling out connections at all.
>     Anyone running 3G alt that can comment??????
>     Thanks in advance!
>     Steve
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